You back away from the mare. As much as you're aching to mount her, you refuse to give away any chance at being human. The mare looks back at you and you almost see a sense of disappointment in her face. She waves her tail again, giving you another smell of her heat. It makes you want her more, but you hold your ground. You hear the woman behind you give a somewhat surprised "hmph".
"Really? Still trying to fight it? Isn't that difficult? Don't you long to relieve that ache within you?" she asks seeming genuinely impressed. You close your eyes and snort with frustration. The lust is driving you mad. You want nothing more then to give in. The frustration gets so bad that you almost can't think of mounting the mare anymore. You feel an urge to break free, to run, to jump, to gallop around the pen like a crazed animal. You pound the ground a couple of times with your right-front hoof. Somehow you feel as though this, too is a trap. But the horse instincts in you tell you not to care, urge you to give in to the joy of being in an open space.
You hold firm, not giving into any of those feelings, the urge to run, to mate, to become a horse. The conflicting feelings seem to drive you even crazier. Stirring within you like an orchestra reaching a dramatic crescendo. You tense your muscles and inhale a deep breath, somehow loosing sense of your legs, your face, your surroundings, the pasture, the sorceress, the mare, of everything. Only the feeling of sheer and utter madness, which your hold your mind against until it reaches it's peak.
And suddenly, you're back. You stand on to legs, your hands clenched into fists, which you release. You wiggle your fingers, you touch your face, you wiggle your toes and bend your knees and arms. You push your fingers through your hair and feel it's normal human consistency. You laugh. You're human, and your free from the effects of that horrible root vegetable as well. Somehow you even find yourself wearing clothes. Not the ones you started with, but clothes nonetheless. You jump in the air and shout with a sense of victory. The sound of a delicate female voice clearing her throat is all that brings you back to the real world.
"You...I mean I...you let me go?" you stammer. She nods.
"You impressed me." she says "I was sure you'd have given in to your lust, even if it meant being a horse forever. But you didn't. What's more it would have been easy for you to allow yourself, in your crazed state, to shift into the mind of a simple animal. But you resisted that as well. Few mundane humans can claim as much, can they Cynthia?" she says and looks over at the white mare. The mare gazes at you for a long moment before trotting away. It becomes clear to you that you're not the only person this woman has done this to.
"Don't feel sad for her." the woman says upon seeing your face "She's committed her own crimes to get where she is."
"Oh." you say. "Well I apologize; for bursting into your mansion, for eating your food, for trying to...well you know." She smiles and nods at you. You smile back and wave to her before turning around and walking back out to the stables and thus begin your long journey home. Suddenly you feel the familiar feeling of your muscles locking into place. You can't move. You hear the woman approaching you. She rests her head on your shoulder and whispers in your ear.
"What makes you think I'm done with you?" she asks.